An overview of performance and infrastructure

Lessons

Why Backend Application Performance Matters Performance Definitions Key Terms What this Course Doesn’t Cover What are the Major Components Involved?

Performance throughout the request cycle

This module goes into depth on each step of the page request cycle. By understanding how a page request is processed and the various components involved, engineers can identify bottlenecks and optimize the performance of their WordPress websites.

Lessons

User Enters URL DNS Resolution HTTP Request Edge Cache Check Origin Web Server WordPress Core PHP WordPress Must Use Plugins (MU Plugins) Database and Object Cache Interactions WordPress Template Loading Plugin and Theme Functionality HTTP Response to Browser Browser Rendering Additional Requests (AJAX, Media, Etc) Summary and Conclusion

Optimizing performance across the whole page cycle: Full Page Caching

Lessons

Full Page Caching – Overview Content Delivery Networks (CDNs) Caching Plugins VIP Edge Caching Time To Live (TTL) Cache Headers Cache Invalidation Cache Misses

Optimizing performance across the whole page cycle: The Application

Lessons

Application Optimization Overview MySQL Queries Cache-ability of Pages Template Over-use Hooks (Filters and Actions) Partial Output Caching WP Cron Uncached Functions Alloptions Infinite Scroll Page Builders AJAX Search Sitemaps Redirects External Requests Client-side JavaScript

Optimizing performance across the whole page cycle: WordPress Core and the Database

Lessons

WordPress and the Database WP_Query Best Practices Offloading Queries to ElasticSearch Query Pre-Fetching Unbounded Queries Over-use of Taxonomies Using NOT IN Post Meta Using LIKE Using EXPLAIN to analyze SQL queries

Optimizing performance across the whole page cycle: Object Cache

Lessons

Object Caching Transients In Memory Caching Avoiding Object Cache Race Conditions Cache Stampede Too Many Cache Requests

Understanding your Traffic Patterns and Usage

Lessons

Understanding Traffic patterns Preparing for a High-traffic Event

Measuring performance

Lessons

Load Testing Measuring Time Spent using PHP Logging Measuring Time Spent using New Relic. Measuring Time Spent Using Query Monitor Performance Alerting

Exercises

Lessons

Quiz